Definitions for macrosporangium
a plant structure that produces megaspores
A sporangium or conceptacle containing only large spores; opposed to microsporangium. Both are found in the genera Selaginella, Isoetes, and Marsilea, all of which are ferns or remotely allied to ferns.
a sporangium or conceptacle containing only large spores; -- opposed to microsporangium. Both are found in the genera Selaginella, Isoctes, and Marsilia, plants remotely allied to ferns
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"macrosporangium." Definitions.net. STANDS4 LLC, 2013. Web. 4 Dec. 2013. <http://www.definitions.net/definition/macrosporangium>.